
My wife and I just re-watched these two movies on DVD. I never noticed this before, but these movies are so similar that they're nearly identical but for the details. I really think that when they were developing the script for Crusade, they just took with the story for Raiders and slightly changed all the details, keeping all the superstructure the same. Instead of an ark, it's a grail. Instead of chopping the bad guy's face with an airplane propeller, they (almost) chop the bad guy with a ship propeller. Instead of Indy dealing with trillions of snakes, he deals with trillions of rats.
I'm also amazed not to be able to find anything about this fact through googling. If you find something, please let me know.
Details in order of occurence in Crusade (but the order is almost entirely the same for both films):
The opening action sequence, in which Indy wraps up a previous adventure CRUSADE: Relic = The Cross of Coronado
RAIDERS: Relic = Gold Idol
Indy finishes teaching a class. Marcus Brody appears just as class is ending CRUSADE: Girl leaves a note on his desk as she leaves
RAIDERS: Boy leaves an apple on his desk as he leaves
Indy receives a mysterious package in the mail CRUSADE: It's his father's Grail notes
RAIDERS: It's Dr. Ravenwood's Ark notes
Indy is presented with the big quest CRUSADE: The holy grail
RAIDERS: The ark of the covenant
Indy flies a plane to an exotic location, leaving a red line behind it on a map CRUSADE: To Venice
RAIDERS: To Nepal
Indy meets the love interest CRUSADE: Elsa Schneider
RAIDERS: Marion Ravenwood
Indy finds the first piece of the puzzle CRUSADE: The X on the library floor covers a portal into the catacombs, where Indy will find the instructions on where to go next.
RAIDERS: The headpiece for the staff of Ra, indicating how to figure out where to go next
Bad guys show up and trap Indy and the love interest in the cavern CRUSADE: In the catacombs. The bad guys light the oily water on fire.
RAIDERS: In the well of souls. Bad guys close the entrance.
Indy and the love interest escape CRUSADE: via a sewer's manhole cover
RAIDERS: via a hole in a wall
On a vehicle, Indy fights bad guys while the love interest is behind the wheel CRUSADE: the vehicle is a speedboat
RAIDERS: the vehicle is an airplane
Indy manages to get the bad guy up against a spinning blade CRUSADE: the propeller of a big ship
RAIDERS: the propeller of the airplane
Indy meets with a friendly adviser who helps decipher the new clue CRUSADE: Brody helps decipher the rubbing that Indy made from the shield engraving
RAIDERS: Old man translates the markings on the headpiece
Indy scuffles with local goons in the town square CRUSADE: Brody is captured
RAIDERS: Marion is captured
Chase scene through rough roads. Crashing through stuff CRUSADE: motorcycles versus truck. Crashing through a checkpoint gate
RAIDERS: horse versus truck. Crashing through construction-worker scaffolding.
Indy needs to choose between going after the captured comrade or going after the treasure CRUSADE: At the fork in the road, he decides to go after the stolen diary instead of after Brody.
RAIDERS: In Belloq's tent, he decides to leave Marion tied up and go for the well of souls
Indy travels on a ship. The enemy is also onboard. CRUSADE: They're on a blimp.
RAIDERS: They're on a large ship at sea.
Indy goes to investigate an unexpected change in the ship's motion CRUSADE: The blimp turns around unexpectedly
RAIDERS: The ships engines stop unexpectedly
Indy abandons ship CRUSADE: He escapes on a little airplane attached to the blimp
RAIDERS: He swims to the enemy's submarine and hitches a ride upon it
Indy's partner is recaptured CRUSADE: After the plane crashes his father is recaptured and held in a tank.
RAIDERS: After the ship is boarded by nazis, Marion is recaptured by Belloq.
Indy finds the enemy's caravan as they travel through a valley CRUSADE: Tanks and cars in the caravan. They have Brody and his father as prisoners.
RAIDERS: The enemy is on foot with the ark. They have Marion as a prisoner.
The bad guys get the treasure first, but they are not cautious enough and get killed for it CRUSADE: Bad guy chooses the wrong grail, drinks from it, and he ages so fast that we see his face decay within seconds.
RAIDERS: Bad guys look inside the ark and their faces melt.
The treasure is ultimately lost CRUSADE: Fell into the chasm
RAIDERS: Locked away by the US government
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